IMR 4064 Smokeless Gun PowderIMR 4064 is a medium-range burn speed powder and is one of the most versatile propellant in the IMR line, used for 223 Remington, 22-250 imr 4064 powder Remington, 220 Swift, 6mm Remington, 243 Winchester Super imr 4064 powder for sale Short Magnum, 308 Winchester, 338 imr 4064 powder for sale Winchester Magnum, and the